Aortic Valve Area by PISA
UNMC Advertisement
  Decrease Font Size  Default Font Size  Increase Font Size
Log In ·  Subscribe
Calcs>Aortic Stenosis>AVA by PISA>1
PISA Radius (r)(cm): cm
Aliasing Velocity (VA)(cm/sec)   cm /sec
Vmax (m/sec) m/sec
Angle () ° degrees
Aortic Valve Area cm2

How to get an AVA by PISA.
Step 1: Obtain a Zoomed CFD of the AV in the mid Transgastric or Deep Transgastric view. If there is a sufficiently stenosed aortic valve, a PISA formation will occur.  The distance from the center of the PISA formation to it's first aliasing velocity edge (where the color shifts from blue to red) is the radius of the PISA formation.
Step 2: Note the aliasing velocity. The aliasing velocity is the velocity where if the flow exceeds this velocity the flow will be displayed with colors from the opposite scale. 
Step 3: Obtain a continuous wave doppler (CWD) of the aortic valve.  The CWD of the aortic valve will yield a flow profile where, utilizing the calipers (or you can trace it) to show the peak velocity.  The peak velocity is the Vmax which is typically 5 m/sec.
Step 4: Obtain an angle of the PISA formation: The angle at the aortic valve is typically 180 degrees, whereas the angle at the mitral valve (for mitral stenosis calculations) is typically 120 degrees.
Step 5: Determine the LVEF and enter the above data. The degree of aortic stenosis can then be calculated.
Aortic Valve
Normal Area                   2.5-4.5 cm2
Mild Stenosis                  1.0-2.5 cm2
Moderate Stenosis         0.75-1.0 cm2
Severe Stenosis             < 0.75 cm2

Previous Page   Next Page
User Comments
Add Page Comment
Add a Comment to the Page
Page Link/Topic:  
Compliment Comment Compliment Compliment Criticism Criticism Information Information
This page has a rating of: 3.000
Rate This Page:                      
Previous Page Next Page
Be a Sponsor Contribute Content/Videos Advertisement Information
This page was generated in 0.004 seconds.